Door Flys Off at 170+ MPH on this BMW E46 M3

When you have a track car, your strip everything down and when you strip everything down, everything might not be so secure. I’ve followed Setra Motorsports for a while and their supercharged 700+ HP E46 M3 track monster so when I came across this video it was pretty comical. This guy is flying the Nurburgring at 173 mph when all of a sudden the door just breaks loose and flies off the track. I wonder if there is any front view GoPro footage from the GT3 he flew by.